
Originally Posted by
striker93
It's similar to the trainee you only trains chest and ignores the upper back musculature. Sooner or later their shoulders will start rounding forward and shoulder problems will arise. If you desire being injury-free, later in life, train for muscle balance between opposing groups.
You don't have to train with weighted ab and oblique exercises, if you are training your lower back with bodyweight-only resistance. In this instance, you wouldn't need external resistance for abdominals and obliques.